Because spammers are bombarding my server again and I don't feel like seeing a ton of spam in the moderation queue, I've activated wp-questionnaire. For now, there's a more or less silly question that needs to be answered for a comment to appear on the pages. Sorry, it's unfortunately necessary at the moment - it's about 30-40 spam comments per day. Yes, they only end up in moderation, but it's still simply annoying.
Once the situation with the spammers has calmed down, I'll probably turn it off again. If anyone notices anything strange regarding the comment function, just let me know (but better via the feedback page and not via the comments).